diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae773d1..cb72667 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ here. The two packages version and release together, from this repository;
 Releases up to and including audiodsp's v0.1.1 shipped both packages from
 there, and are recorded in its changelog.
 
-## Unreleased
+## v0.4.1.dev1 (2026-10-15)
 
 ### Fixed
 
diff --git a/VERSION b/VERSION
index 1d0ba9e..41024b3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.4.0
+0.4.1.dev1